Activity 34
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The
occupational hygienist has also given you the following results from
personal monitoring over an 8 hour period for manganese exposure from
welding fumes.
| Measured concentration (mg/m3) | Exposure time (hours) |
| 0.6 | 0.5 |
| 1.8 | 1.5 |
| 2.0 | 2.0 |
| 1.1 | 3.0 |
| 2.6 | 1.0 |
- Using WES 2016, look up the TWA (8hours) and STEL (15 mins).
- Using the monitoring data, calculate the 8 hour time-weighted average for exposure on this day. Use the formula:
TWA= ∑ (Concentration of contaminant × exposure time in hours)/8
- Comment on the effectiveness of overall control strategies in place, and give recommendations for further action, based on published guidelines and standards.
(500 - 600 words approx.)
